Construction of concrete buildings and nail-plug therefor.



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CONSTRUCTION OP CONCRETE BUILDINGS AND NAIL PLUG THEREPOR.

APPLICATION FILED SEPT. 2, 1902.

N0 MODEL.

INI/ENIQR.

` WJTNESSES.-

x M m n A ams PETERS cu., rumumo.. Asume-row D UNITED STATES PATENTFFICE.

FRANKLIN W. GARRETT'SON, OF BALTIMORE, MARYLAND.

CONSTRUCTION 0F CONCRETE'BUILDINGS AND NAIL-PLUG THEREFOR.

SPECIFICATION forming part of Letters Patent No. 724,461, dated April 7,1903.

Application filed September 2, 1902. Serial No. 121,830. (No model.)

To @ZZ whom t may concern:

Be it known that I, FRANKLIN W. GARRETT- SON, a citizen of the UnitedStates of America, and a resident of Baltimore city, in the State ofMaryland, have invented certain new and useful Improvements inConstruction of Concrete Buildings and Nail-Plugs, of which thefollowing is a specification.

My invention has for its object to provide means for attachingfurring-strips and lathing or other material to joists, ooring, columns,or walls made of concrete whereby the drivin g of nails into such meanswill not tend to crack the concrete; secondly, to provide a shield tocover the openings in the attaching device; third, to provide means forsecuring the attaching device into the concrete or to the strengtheningmetal in said concrete.

Referring to the drawings, Figure 1 is a' sectional view of my improvedattaching device, showing an ordinary wire spike driven into the plug.Fig. 2 is a plan view of the plug with the shield removed. Fig. 3 is asection of concrete girder or flooring, showing the strengthening metalandplugs in position.

1 is the daring edge of a tubular piece of metal 2, having depressions 46 7 8 or teeth stamped into same, which when these teeth are formedwould leave perforations in the metal tube 2, and to cover theseperforations a shield 5 is placed over the top and bottom of the tube 2to prevent the concrete getting into the said tube 2. This shield 5 maybe secured by rivets 3 and 9 to the plug or tube 2.

14 is a means for securing the tube or plug 2 into the concrete 12 andmay be secured to the plug 2 by being made integral with thel tube orplug 2 or inserted through an opening in said plug. This hook 14 may beembedded in the Vconcrete or may be caught over the strengthening metal13.

l5 is a series of holes near the exposed edge of the plug 2, by whichmetal lathing may be secured to the said plug 2.

The nail 10 may be roughened or smooth,

` and when driven into the plug 2 will be gripped by the teeth 4 6 7 8,risc., said teeth being placed on such angle that any tendency towithdraw the nails would result in the teeth getting a stronger biteonto the nail. These teeth may be sharp or dull at the biting edge, thegrip being regulated by the angle at which the teeth are set. Thisnail-plu g 2 is preferably made of spring metal, so that when the teeth:4 6 7 8 are formed -they will tend to remain in the position in whichthey are stamped.

Having described my invention, what I claim is- 1. A wall-plug havingperforations and a shield adapted to cover the perforations,substantially as described. l

2. The combination with a joist-girder or

